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Note 6 - Fair Value - Reconciliation of Level 3 Assets Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Balance $ 691,426 $ 687,397 $ 641,340 $ 695,465
Purchase of investments 72,762 42,369 162,766 116,058
Warrants received and classified as Level 3 247 117 618 282
Principal payments received on investments (47,123) (78,493) (85,171) (129,238)
PIK interest on investments 1,566 243 2,844 528
Proceeds from sale of investments (1,904) (783) (2,008) (784)
Net realized gain (loss) on investments (6,122) (9,294) (6,283) (9,293)
Unrealized (depreciation) appreciation included in earnings (38,638) (21,658) (41,063) (53,545)
Transfer out of Level 3 (89) 0 (89)  
Transfer out of warrant and equity investments 0 0 0 0
Other (94) 1,092 (923) 1,517
Balance 672,031 620,990 672,031 620,990
Warrants and equity received and classified as Level 3 247 117 618 282
Debt [Member]        
Balance 645,629 643,567 596,025 638,779
Purchase of investments 72,762 42,225 162,766 113,854
Warrants received and classified as Level 3 0 0 0
Principal payments received on investments (46,859) (78,493) (84,749) (129,238)
PIK interest on investments 1,566 243 2,844 528
Proceeds from sale of investments (1) (1) (1) (2)
Net realized gain (loss) on investments 1 (9,364) 2 (9,363)
Unrealized (depreciation) appreciation included in earnings (25,005) (18,005) (27,965) (34,811)
Transfer out of Level 3 0   0  
Transfer out of warrant and equity investments 0 (2,093) 0 (2,093)
Other (94) 1,092 (923) 1,517
Balance 647,999 579,171 647,999 579,171
Warrants and equity received and classified as Level 3 0 0 0
Warrant [Member]        
Balance 14,994 17,159 14,732 16,438
Purchase of investments 0 0 0 0
Warrants received and classified as Level 3 247 117 618 282
Principal payments received on investments 0 0 0 0
PIK interest on investments 0 0 0 0
Proceeds from sale of investments (1,229) (579) (1,230) (579)
Net realized gain (loss) on investments 955 (99) 690 (99)
Unrealized (depreciation) appreciation included in earnings (431) 3,858 (274) 4,414
Transfer out of Level 3 (89)   (89)  
Transfer out of warrant and equity investments (334) 0 (334) 0
Other 0 0 0 0
Balance 14,113 20,456 14,113 20,456
Warrants and equity received and classified as Level 3 247 117 618 282
Equity Securities [Member]        
Balance 27,139 12,974 27,139 25,611
Purchase of investments 0 144 0 2,189
Warrants received and classified as Level 3 0 0 0 0
Principal payments received on investments 0 0 0 0
PIK interest on investments 0 0 0 0
Proceeds from sale of investments (622) (203) (641) (203)
Net realized gain (loss) on investments 200 169 219 169
Unrealized (depreciation) appreciation included in earnings (20,712) (172) (20,712) (14,854)
Transfer out of Level 3 0   0  
Transfer out of warrant and equity investments (123) 0 (123) 0
Other 0 0 0 0
Balance 5,882 12,912 5,882 12,912
Warrants and equity received and classified as Level 3 0 0 0 0
Other Investment [Member]        
Balance 3,664 13,697 3,444 14,637
Purchase of investments 0 0 0 15
Warrants received and classified as Level 3 0 0 0 0
Principal payments received on investments (264) 0 (422) 0
PIK interest on investments 0 0 0 0
Proceeds from sale of investments (52) 0 (136) 0
Net realized gain (loss) on investments (7,278) 0 (7,194) 0
Unrealized (depreciation) appreciation included in earnings 7,510 (7,339) 7,888 (8,294)
Transfer out of Level 3 0   0  
Transfer out of warrant and equity investments 457 2,093 457 2,093
Other 0 0 0 0
Balance 4,037 8,451 4,037 8,451
Warrants and equity received and classified as Level 3 $ 0 $ 0 $ 0 $ 0